stagfe/app/Models/Pro.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Pro extends Model
{

    protected $table = "pro";

    public function displayName() {
        $name = $this->name_last . ', '. $this->name_first;
        if(empty($name)) $name = $this->name_display;
        return $name;
    }

    public function company(){
        return $this->hasOne(Company::class, 'id', 'company_id');
    }

    public function companyPros()
    {
        return $this->hasMany(CompanyPro::class, 'pro_id', 'id');
    }

}